Lady Susan Vane-Tempest

"Lady Adolphus Vane-Tempest (7 April 1839 – 6 September 1875), born Lady Susan Charlotte Catherine Pelham-Clinton, was a British noblewoman and one of the mistresses of King Edward VII of England when he was Prince of Wales. Lady Susan was a bridesmaid to Victoria, Princess Royal and two years later became the wife of Lord Adolphus Vane-Tempest. She took the Prince as her lover in about 1864 following her husband's death, and allegedly gave birth to his illegitimate child in 1871."

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Links:

http://en.wikipedia.org/wiki/Lady_Susan_Vane-Tempest

http://www.thepeerage.com/p6181.htm